浮筏隔振及声辐射同步定相控制研究

On synchrophasing control of vibration and sound radiation for a floating raft vibration isolation system

针对船舶结构中的振动传递和声辐射问题,提出并研究了同步定相控制技术。同步定相控制通过调节浮筏结构上多台旋转或往复机械设备之间的相位关系,使它们通过浮筏隔振系统传递到舱段结构上的振动最小,进而减小船体的对外声辐射。各激振设备的相位关系采用遗传算法进行优化,弹性舱段结构上的浮筏隔振系统同步定向控制的理论和实验研究结果表明,最优和最差相位相比,舱段结构上22个误差评价点的加速度平方和最大衰减量可达13.2 dB,周围布置的10个传声器的声压均方和最大衰减量可达20.4 dB。可见同步定相控制技术能有效地控制振动的传递,减小舱段结构的声辐射,是简单高效的振动和声辐射控制方法。

For the purpose of solving the problems of vibration transmission and sound radiations in ships, synchrophasing control technology was presented. The phases of multiple rotating or reciprocating machines installed on a floating raft were adjusted by synchrophasing control to minimize vibration transmission from the floating raft to a hull structure, and then as a result the sound radiation from the hull structure was reduced reasonably. Relative phases between each of the two vibrating machines were optimized in order to minimize the sum of the squared acceleration responses of the hull structure by using genetic algorithm. Synchrophasing control for the floating raft vibration isolation system installed on a flexible hull-like structure was investigated theoretically and experimentally. The results show that by comparing the optimal phases and the least optimal phases, the maximum reduction of the sum of squared acceleration responses measured by 22 error sensors on the hull structure and the maximum reduction of the mean squared sound pressures measured by 10 microphones around it are up to 13.2 dB and 20.4 dB by synchrophasing control, respectively. Synchrophasing control is a simple and efficient method for controlling the vibration transmission and sound radiations of the hull structure.